In reply to fmck:
Maybe if they had spent time cleaning Arran would have a descent low lying crag.
It looks like someone made up the stuff about the lichen being rare. I found this.
This 74 ha shoreline SSSI runs along a 4 km stretch of coast from Drumadoon Point to Tormore, north-west of Blackwaterfoot on the west coast of Arran. The site is designated for 2 geological features, its Triassic sedimentary rock layer sequence and its Palaeogene volcanic rocks.
The Triassic red beds were formed as layers of sand, gravel and mud sediments deposited around 240 million years ago. Past heavy erosion has exposed the layers and additional structures, such as ripple marks, mud cracks and trace fossils including worm burrows and tracks made by reptiles, provide information about the environmental and climatic conditions at that time. The good visibility and accessibility of the exposures contribute to the favourable condition of this feature.
The igneous rocks at the site date from subsequent volcanic activity about 60 million years ago. In common with other igneous rocks on Arran, they were produced by below ground igneous intrusion and two types of small scale intrusions are represented. These are dykes, orientated vertically, cutting across the layering within the sedimentary rocks, and sills which are orientated horizontally. The sills and dykes on the site are ‘composite’, consisting of both acidic granite-like igneous rocks and intrusions of basic basalt lava. The dykes and the Drumadoon Sill are in favourable condition.